Calling device.



E. W. ADAMS.

CALLING DEVICE.

APPLICATION FILED APR.Z4, ml].

.IIIHIIIHIIIHHHII THIHH,

M Van far r Edgar 34 flaky/775.

f/i i w/ia Affy GALLIQIG DE To all whom it may concern: 7

Be it known that-I; Enema; W. ADAMS, a citizen of the UnitedStates,residing at East Orange in the county of Essex and State of NewJersey, have invented certain new and useful Improvements in CallingDevices, of which'the'following is a fulh clear, concise, and exactdescription.

This invention relates to calling-devices of the type employedindirectivelyfcon trolled machine switching telephone-systems, and has forits object-the provision of an improved form of- 'callingf'devicethrough the use of which the capacity ofan exchange system may begreatly inf creased. f

In telephone exchange systems, the practice has been to include not morethan ten thousand subscribers inflone exchange dis divided into-severaltrict, the system being such districts, each having a separatejname. Theusual telephonedesignation, then, c'on-*' sists of a name and-a fourdigit n'iunberf;

The advent of the nutomat ictelephone has causedr the exchange nameto-he leftout of: the designation and lone'or'more digits=t0"* i'beSllbStltlltGd; withthe result that in large systems it will be necessarytouse six or oven seven digits in a telephone number. 'lhis, however, isphysiologically-impraetL cal, since it is generally 'admitted' that thelayman is only capable 'of remembering and sending numbers of fivedigits or less; 7 i Another object. of the invcntion,"'then, is toprovide a cnllingde'vice by means of which the conventional telephone'num'ber' may be transmitted, it being an advantage to designate atelephone by a nu-meand "11 number ratheinthan by rt-longer nun'ih'er"I. I :z ti A feature of the invention isthe use, in addition ton dialswiteh of any well knuwir type of n number'ofi'keys; 'whiclr'inay 'be'operated before thexlial will modify thetimpnlses sentbythe fennel insuch a way. as to extend the call to any given exchange district.

In certain telephone systems, two relays are provided, both responsiveto th'e'operw NEWJEitsIiiirI COMPANY, mconrone'rnn, oF-NEw-YoRx, my 4'cone l 1 .I i telephones 'n mentioned train.

switch andwhich tion of the .calli rclay'sfis made" and the othe strongcurren vice is 'iiiade'to relays'gw ill introduces '1 the patent grantedI gn gitio ud feature tram, ofdimpulses 1.4 itlugujtkanydiscrimofthesuhseriher, v x I sziine niunher, of iy'ldalled with theten-posi- )VitlftllG-(lgllhld dial in the ahme it'pp licatidrii "I Y iIn the prcfer're 'niho'di ment of the ini t eaccompanying By the netwoof such keys, v of ull'ecled and lis of, "i tniililses may he sent.

tion dial" With fan iiiipprop ri'ate glesjgnation of such y ex h n e Vnos may he used as will hereir iafterfgppea' i It i'sinteiided tl besent by the The atuiit'idnk the uationlof the si 3th gna te; the; keys,1 to 6 as est; 'Qentrul, and Main, ed by the number thfitnd: if'weindicate the unaffected trains .o

ter N, and the 'uli'ected trains by the letterl i,

clgtjraeterg the ,"lust.

H e, iel o'mdieating thatno key has beenpr jpi s sienpn T0 wns rsnuELECTRIC w' ese nt 1 'hon nlln the i iift j fiihir trains of impulsesris. calling itlqlflift' I y bnegliey -ivil'l changefthe characterofftheflli'rstl train sent, the actg a f .impulsefs hy the lctr" -Troinsnf Keys I im ulses. pressed. Designation of called telephone. NN-NN-t)tl1234 L l N X t)1 North. 1 2 3 4 N L N N t)-2 South 1 '2 3 4 N N L ()--IlEast 1 .2 3 4 N N L ()-4 'est 1 2 34. I; 0-5 (Pll il'tiLm'. 1. 2 3 4 N NL L 0 -6 Main 1 2 3 4 L X L N 1- 3 .\"orth East-u--- 1 '2 3 4 N L L X 23South East--- 1 2 3 4 L X L L 1 South \\'est 1 2 3 4 L N X L '1--l North\\'est 1 2 3 '4, L L L X 5-3 (entral l::\. t l 2 3 4 i L l N L 5-4("eutral 'est 1 2 3 4' L NJ, L lt3' North .\lain 1 2 3'4 Ni, i L 2-6South".\lain 1 .2 3 4 L L L L .'-t3 (eutral .\lain 1 2 3 4 we may callthe same telephone numberin sixteen dlti'erent. exchange district afterthe mauucr of the following tahle:

or smaller numher'of digits are used in the designation of thet.ele|)h(mes.

Other new and useful featul'eswill appear in thcfollowing detaileddescription and the appended elaims.

v Figure l is a side view of a telephone desk stand to which the"calling device, emhodyiug the features of this invention. is'applied.la rt ot' the desk stand is shown broken awav so that a,-\'ie \v ol' theinterior may he had. Fig. :2 is a plan view of the same. .Fig. 3 is adiagrammatic representation of the. circuit connections of a callingdevice.

Six keys, numhered l to (S, inclusive, are provided, whieh,\vlu-npressed, setup circuit; conditions to extend the calling line into anygiven exclumgedistrict, A dial switch 7 is also provided and may he ofthe type disclosed in the patent granted to Forslwrg, Noveiuher 3t),ltllli. No. l,lti1.8:'i4,

'lhe suhscriher, in manipulating the dial switch, places his finger inone of' the linger holes and rotates the dial Sina clockwise directionuntil his linger strikes the stop 9. The stop 9, instead of beingstationary as in the above mentioned patent is attached to a shaft 10,to the lower end at which is secured an arm 11 carrying a pawl 12. Uponthe. movement of the arm 11, the pawl 12 engages the ratchet wheel 13,and rotates the arm 14 successively into engagement with the contacts15, 16. I7 and 18. that is. upon the first rotation of the dial, the arm14 will be brought into engagement. with the contact;

15. The dial, in returning to its norgnal position, opens its contacts19 in thewellv known manner to send the train of impulses over thetelephone hne to wluch this apparatus is connected. Upon the secondrotation of the dial the' arm 14 will be moved are so arranged that,upon their depression,

they are held in their actuated positions through the agency ofindividual latches 21, 22. 2a, 2 25 and 20;

2T designates the switchhook of the telephone. Secured to the switchhookis a rod 18, which is attached at its lower end to a bell-cranklever 29,and through such lever operates the rod 30. Rod 30, in turn, is looselyconnected to a rod 31 which. upon the movement toward the left, drawseach one of the latches 21- 'to 26 out of engagement, with the buttons 1to 6 in such a' manner as to allow thennto return to their normalpositions under the influence of suit:- able springs (not. shown), Atthe same time the .rod 32,- securcd to-' rod 31, causes the movement. ofthe-locking pawl 20, whereby the itrin 14 may be released and returnedto its normal.positionythrough the agency of.

the spring 37.

It. should be noted that. in the operation 'of this calling dcvice,'thereeeiver of the telephone is first, removed from the hook. This movesthe rods 3Q, 31 and 32 to the right in such a. manner that the latches21 to 26 are made operative and the keys 1 to 6 mav he depressed in anycombination and he held in their actuated positions. The arm 14 may herotated aud'will remain in its set positions since the movement. of rod32 has allowed the cam 20 to become operative. At the end of aeonversation, when the receiver is replaced on the hook. the, movementof the rods 30,431 and 32 in the opposite direction will withdraw thel'atehcs 21 to Qtland the cam 20 to release the, keys 1' to 6 and thearm 14 to their-normal positions.

Suppose the keys 1 and 3 arevdepressed before the dial switch 7 isrotated. The car- .rcnt furnished to the telephone line from the centralotfice travels over the line,33, the.

19 is bridged by the resistance R through key 1, contact 15 and arm 14,hence the impulses transmitted at this time are affected, and the actionof the selector switch, which receives the impulses, will be, in turn,affected. a 7

Upon the, second manipulation of the dial '8, however, the arm 14 1Sanoved into assoeiation with the terminal 16, and, upon the return ofthe dialS, and the consequent se-' ries of openings of the linec1rcu1t.at the contact 19, an unaffected series of impulses will betransmitted which will. differently affect the sector switch. a

Upon the third manipulation of the dial 8, the arm H will be broughtinto association with the contact .17 and since the key 3 has beenactuated, the series of impulses sent at this time \vill be all'ected.

Upon the last manipulation of the dial S, the arm 1-! will be moved intoassociation with the terminallS, and the train of inn pulses sent atthis time will be unatl'ected in the manner previously described.

At the end of the conversation, the placing of the receiver onthe hookwill cause the return to normal of the keys 1 and 3. and the arm ll, aspreviously described.

What is claimed is: 3

1. In a calling device, an impulse transmitter fol-sending trains oflike impulses,

and a set of keys for-modifying the character of all impulses in each ofsaid trains. of impulses.

2. In a calling, device, an impulse tmnsmitter l'or sendin; trains oflike impulses, and a set of keys for modifying the electrical characterof all impulses in each train of said impulses.

3. In a calling device,a dial switch for sending trains of impulses, a.set of keys impulses, and means controlled by the suc-.

cessive operation of said dial switch for:

operatively associating said keys with said dial switch.

5. In a calling: device, an impulse transmitter, a set of keys. formodifying the character of impulses sent by said transmitter, and meansresponsive to the successive operation of said impulse transmitter foroperatively associating, said keys with said impulse transmitter.

6. In a calling device. an impulse transmitter. means for mot'lityingthe character of impulses sent by said transmitter; and means responsiveto the successive actuation of said impulse transmitter for associatingsaid impulse modifying means with said impulse transmitter.

7. In a calling device. an impulse transmit-te'r for sending trains ofimpulses, a key for modifying the character of the first train ofimpulses sent, a key for modifying the character of the second train ofimpulses sent. a key for modifying the character of the third train ofimpulses sent, a key for modifying the character of the fourth train ofimpulses sent, a key for modifying the character of the first and secondtrains of impulses sent, and a key for modifying the character of thethird and fourth trains of impulses sent.

In witness whereof, I hereunto subscribe my name this 20th day of AprilA. D., 1917.

EDGAR IV. ADAMS.

